Picture frame



FIG. 1 is a bottom, front, and left side perspective view of a picture frame, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings are directed to portions that form no part of the claimed design. 

CLAIM The ornamental design for the picture frame, as shown and described. 